1 """ TCP server that communicates with terminals """
3 from logging import getLogger
5 from socket import socket, AF_INET6, SOCK_STREAM, SOL_SOCKET, SO_REUSEADDR
7 from struct import pack
11 from .gps303proto import (
18 from .zmsg import Bcast, Resp
20 log = getLogger("gps303/collector")
24 """Connected socket to the terminal plus buffer and metadata"""
26 def __init__(self, sock, addr):
33 log.debug("Closing fd %d (IMEI %s)", self.sock.fileno(), self.imei)
38 """Read from the socket and parse complete messages"""
40 segment = self.sock.recv(4096)
43 "Reading from fd %d (IMEI %s): %s",
49 if not segment: # Terminal has closed connection
51 "EOF reading from fd %d (IMEI %s)",
57 self.buffer += segment
60 framestart = self.buffer.find(b"xx")
61 if framestart == -1: # No frames, return whatever we have
63 if framestart > 0: # Should not happen, report
65 'Undecodable data "%s" from fd %d (IMEI %s)',
66 self.buffer[:framestart].hex(),
70 self.buffer = self.buffer[framestart:]
71 # At this point, buffer starts with a packet
72 frameend = self.buffer.find(b"\r\n", 4)
73 if frameend == -1: # Incomplete frame, return what we have
75 packet = self.buffer[2:frameend]
76 self.buffer = self.buffer[frameend + 2 :]
77 if proto_of_message(packet) == LOGIN.PROTO:
78 self.imei = parse_message(packet).imei
80 "LOGIN from fd %d (IMEI %s)", self.sock.fileno(), self.imei
82 msgs.append((when, self.addr, packet))
85 def send(self, buffer):
87 self.sock.send(b"xx" + buffer + b"\r\n")
90 "Sending to fd %d (IMEI %s): %s",
102 def add(self, clntsock, clntaddr):
103 fd = clntsock.fileno()
104 log.info("Start serving fd %d from %s", fd, clntaddr)
105 self.by_fd[fd] = Client(clntsock, clntaddr)
109 clnt = self.by_fd[fd]
110 log.info("Stop serving fd %d (IMEI %s)", clnt.sock.fileno(), clnt.imei)
113 del self.by_imei[clnt.imei]
117 clnt = self.by_fd[fd]
122 for when, peeraddr, packet in msgs:
123 if proto_of_message(packet) == LOGIN.PROTO: # Could do blindly...
124 self.by_imei[clnt.imei] = clnt
125 result.append((clnt.imei, when, peeraddr, packet))
127 "Received from %s (IMEI %s): %s",
134 def response(self, resp):
135 if resp.imei in self.by_imei:
136 self.by_imei[resp.imei].send(resp.packet)
138 log.info("Not connected (IMEI %s)", resp.imei)
143 zpub = zctx.socket(zmq.PUB)
144 zpull = zctx.socket(zmq.PULL)
145 oldmask = umask(0o117)
146 zpub.bind(conf.get("collector", "publishurl"))
147 zpull.bind(conf.get("collector", "listenurl"))
149 tcpl = socket(AF_INET6, SOCK_STREAM)
150 tcpl.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
151 tcpl.bind(("", conf.getint("collector", "port")))
153 tcpfd = tcpl.fileno()
154 poller = zmq.Poller()
155 poller.register(zpull, flags=zmq.POLLIN)
156 poller.register(tcpfd, flags=zmq.POLLIN)
163 events = poller.poll(1000)
164 for sk, fl in events:
168 msg = zpull.recv(zmq.NOBLOCK)
169 tosend.append(Resp(msg))
173 clntsock, clntaddr = tcpl.accept()
174 topoll.append((clntsock, clntaddr))
175 elif fl & zmq.POLLIN:
176 received = clients.recv(sk)
179 "Terminal gone from fd %d (IMEI %s)", sk, imei
183 for imei, when, peeraddr, packet in received:
184 proto = proto_of_message(packet)
194 if proto == HIBERNATION.PROTO:
196 "HIBERNATION from fd %d (IMEI %s)",
201 respmsg = inline_response(packet)
202 if respmsg is not None:
204 Resp(imei=imei, packet=respmsg)
207 log.debug("Stray event: %s on socket %s", fl, sk)
208 # poll queue consumed, make changes now
210 poller.unregister(fd)
213 log.debug("Sending to the client: %s", zmsg)
214 clients.response(zmsg)
215 for clntsock, clntaddr in topoll:
216 fd = clients.add(clntsock, clntaddr)
217 poller.register(fd, flags=zmq.POLLIN)
218 except KeyboardInterrupt:
222 if __name__.endswith("__main__"):
223 runserver(common.init(log))